The First Air Army (Japanese: 第1航空軍, romanized: Dai 1 Kōkū gun) was part of the Japanese Imperial Army during World War 2.
Formed under Military Ordinance Order No 31 on 13 April 1942 and initially headquartered at Gifu on 5 June 1942 before being relocated to Miyakezaka, Tokyo in response to the allied airstrikes on mainland japan.
On 8 April 1945, in accordance with Operation Ketsugō (決号作戦, ketsugō sakusen), the countermeasure plan of Operation Downfall, the 1st together with the 2nd, 5th, and 6th Air Armys were transferred to the Headquarters of the Army Air Force.
Each Air Division consisted of an Air Brigade (飛行団, Hikōdan) together with base and support units and a number of Independent Squadrons.
The Air Combat Group was a single-purpose unit consisting typically of three Squadrons (飛行隊, Hikōtai), divided into three flights (小隊, shōtai) of three aircraft each.